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(No Model J. M. ANDERSEN.

UTLET INSULATR. No. 582,514. PatentedMay 1l, 1897.

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UNITED STATES PATENT OFFICE.

JOHAN M. ANDERSEN, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- I'IALF TOALBERT ANDERSON, OF SAME PLACE.

OUTLET-INSULATOR.

SPECIFICATION forming part of Letters Patent No. 582,514, dated May 11,1897.

Application led March 16, 1897. Serial No. 627,810. (No model.)

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Be it known that I, JOHAN M. ANDERSEN, residing in Boston, in the countyof Suffolk and State of Massachusetts, have invented an Improvement inOutlet-Insulators, of which the following description, in connectionwith the accompanying drawings, is a specification, like letters on thedrawings representing like parts.

'This invention relates to electric insulators of that class known as outiet-insulators and such as are now commonly employed in theinterior-conduit system of wiring buildings.

My present invention has for its object to provide a simple, cheap, andefficient outletinsulator which is adapted, if desired, to be securedonto the end of the pipe of the interior conduit or which may be securedonto a section of pipe which is screwed onto the end of theconduit-pipe.

In accordance with this invention the outlet-insulator comprises asleeve of suitable insulating material provided on its innereircumference with screw-threads to engage corresponding screw-threadsof the metal pipe of the conduit. The sleeve of insulating material maybe provided with a metal ring or band to strengthen it and permit it tobe turned onto the pipe with a wrench, if desired, without danger ofcrushing the said sleeve.

Figure 1 is a section of an outlet-insulator embodying this invention,and Fig. i a modification to be referred to.

Referring to the drawings, d represents a sleeve of insulating material,which is of suitable character or quality to permit it to be provided onits inner circumference with screw-threads d', which are adapted toengage corresponding screw-threads on the end of a pipe a2. The pipe a2may be the end of the pipe forming part of the interior conduit, or itmay be a section of pipe which is adapted to be secured to theconduit-pipe.

The sleeve a is preferably provided on its inner circumference With anannular shoulder l), which is designed to abut against the end of thepipe a2 when .the said sleeve is screwed thereon, the said shoulderacting as a stop to limit the movement of the sleeve onto the pipe a2.The sleeve a is preferably reinforced or strengthened by a metal band orring o', as shown in Fig. l, so that, if desired, the said sleeve may bescrewed upon the pipe a2 by means of a wrench or other tool with lessliability of crushing or breaking the said sleeves, but the ring or-band may be dispensed with, as shown in Fig. 2.

The outer end of the sleeve of insulating material prevents theinsulated wires (not shown, but which extend out through the insulator)from making contact with the pipe a2 and avoids injury to the insulationon said wires, and consequently avoids short circuits and leaks fromthis cause.

The outlet-insulator herein shown and described is simple, cheap, andhighly efficient.

I claim- 1. As an improved article of manufacture, an outlet-insulatorfor interior-conduit systems, consisting of a sleeve of insulatingmaterial provided on its interior with screwthreads, substantially asand for the purpose specified.

2. As an improved article of manufacture, an outlet-insulator forinterior-comluit systems consisting of a sleeve of insulating materialprovided on its interior with screwthreads, and a reinforcing ring orband on the outside of the said sleeve, substantially as and for thepurpose specified.

3. As an improved article of manufacture, an outlet-insulator forinterior-conduit systems, consisting of a sleeve of insulating materialprovided on its inner circumference with screw-threads to engage thethreaded end of a pipe, and with a shoulder to abut against the end ofthe said pipe, substantially as described.

In testimony whereof l have signed my name to this specification in thepresence of two subscribing witnesses.

JOHAN M. ANDERSEN.

Witnesses Jas. H. CHURCHILL, J. MURPHY.

